Loader Bobcat 773. Manual - part 123

HYDRAULIC CONTROL VALVE (Cont’d)

Rubber Boot

Remove the two screws (Item 1) [A] on the rubber boot
retainer.

Installation: Tighten the screws to 90–100 in.–lbs.
(10,2–11,3 Nm) torque.

Remove the rubber boot (Item 1) [B] and retainer (Item
2) [B].

Remove the seal retainer (Item 3) [B] and O–ring (Item
4) [B].

A

N–17279

1

1

–10–56–

Service Manual

773 BICS Loader

Added June 01

B

N–17280

1

2

3

4

HYDRAULIC CONTROL VALVE (Cont’d)

Lift And Tilt Spool

Remove the rubber boot from the other end of the spool.
(See Page 10–56.)

Remove the two screws (Item 1) [A] from the end cap (lift
or tilt).

Installation: Tighten the screws to 90–100 in.–lbs.
(10,2–11,3 Nm) torque.

Remove the end cap (Item 2) [A] (lift or tilt).

Remove the spool (Item 1) [B], centering spring, back–up
washer and seal from the control valve.

At the other end of the spool bore, remove the spool seal
(Item 1) [C] and O–ring (Item 2) [C].

Installation: If both spools are removed at the same
time, mark the lift spool (Item 1) [D] and tilt spool (Item 2)
[D] so they will be put in their original bore.

NOTE: To install new spool seal (Item 2) [B], remove

the centering spring or See Page 10–62 for
seal replacement without removing the
centering spring.

NOTE: The centering spring (Item 3) [D] is white on

all 700 series loaders.

C

N–17492

1

2

D

N–17261

1

2

3

3

A

N–17286

1

2

1

Service Manual

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773 BICS Loader

Revised Nov. 01

B

N–17288

1

2

A

N–17287

1

2

HYDRAULIC CONTROL VALVE (Cont’d)

Lift And Tilt Spool (Cont’d)

The tool listed will be needed to do the following
procedure;

MEL1285 – Spring Tool

Put the linkage end of the spool in the vice [A].

Install the spring tool (Item 1) [A] over the centering
spring.

Loosen the bolt (Item 2) [A] holding the centering spring
to the spool.

Installation: Tighten the bolt to 90–100 in.–lbs.
(10,2–11,3 Nm) torque.

Remove the adapter (Item 1) [B], spring cap (Item 2) [B],
spring (Item 3) [B], and washer (Item 4) [B] from the
spool.

NOTE: Be careful when removing the bolt from the

centering spring, because there is spring
pressure.

B

N–17290

1

2

3

4

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Service Manual

773 BICS Loader

Added June 01

NOTE: During installation of the centering spring to

the spool, make sure the adapter is centered
in the washer hole (Item 1) [B]. If the adapter
is not centered, it can cause the bolt to break
during installation.

Inspection

Check the spools for wear or scratches.

Check that the spools are not loose in their bore.

Check that the centering springs are not broken.

Check that the load check valve seats are not worn.

Check the load check poppet for damage.

Check the rubber boots and retainers that they are not
worn or damage.

Replace all parts as needed.

HYDRAULIC CONTROL VALVE (Cont’d)

Lift And Tilt Spool (Cont’d)

Lift Spool Only: To remove the plastic plug from the lift
spool:

Make a center point in the plug using a 1/16 inch drill.

Drill a hole all the way through the plug using a 7/64 inch
tap drill.

Turn a 6–32 tap into the plug. Pull the tap and plug out of
the spool. Be careful, do not break the tap.

Clean all the debris from the inside of the spool bore.

Installation: Slide the O–ring over the nipple on the
plastic plug. Install the plastic plug in the spool. Install the
bolt so that the end of the plug is about 0.60 inch (15,2
mm) from the end of the spool [A].

A

MC–02421

0.60 inch

(15,2 mm)

Plastic

Plug

O–ring

Service Manual

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773 BICS Loader

Added June 01

B

N–17260

1